We have 12 hens, five of which we've had about a year and the other 7 were hatched in May. About two months ago we noticed our egg production was dwindling from our five established hens and the others were just starting to lay one here or there. We also noticed they had worms, so my husband added a vermicide to their water, per the instructions. A few weeks later we were getting even fewer eggs and when I cleaned the coop I still saw worms, so my husband re-treated thinking the first time just didn't work. Well, now we were getting one to two eggs per day. It seems the whole flock shut down and I'm left wondering if we somehow poisoned them with the vermicide, because I'm not sure what else it could be. Last fall egg production tapered off a bit, but we still got several a day. Any ideas?? I'm so frustrated because I had to BUY eggs this weekend for the first time in two years.